Drum-controller for electric motors.



No, 844,65. PATENTED FEB. 19, 1907.

T. E. BARNUM.

CONTROLLER FOR ELECTRIC MOTORS.

APPLIUATION FILED NGV. 9, 1903.

3 SHEETS-SHEET 2.

dacu 4 SSHBETS-SHIILT 3.

50 Y ma PATENTED PEB. 19, 1907.

APPLICATION FILED NOV. 9, 1903.

THOMAS E. BARNUM', OF MIIJWAUKEE, WISCONSIN.v

DRUM-'CONTROLLER FOP? ELECTRIC MDTORS- Specification of Letters Patent.

Patented Feb. 19, 1907.

Application led November 9,1903. Serial No. 180,469.

To @ZZ whom b ,w1/afg con/cern;

Be it knownthat I, THOMAS E. BARNUM, a citizen of the United States. residingat Milwaukee, in the county of Milwaukee and State of ll'isconsin, have invented a certain new and useful Improvement in Drum-Com' trollers for Electric Motors, of which the following is a full,"^'liear, concise, and exact description, reference being had to the accompair'viiig drawings, forming a part of this specification. l

My invention relates to electric-motor controllers.

There have been some devices of this character designed in which contacts for controlling both an armature resistance and a field resistance are arranged upon the cylindrical surface of a drum, so that while/a single device the motor may be started and its speed regulated. In such a device the drum must necessarily be made very long in order to accommodate. all the contacts, and therefore the parts of the controller cannot be compactly assembled.

The present invention has for one of its ob jects to reduce the size of the controller. In the accomplishment of this end in the preferred embodiment ofmy invention one set of contacts is arranged upon the cylindrical surface of the drum, while another set of contacts is arranged in a plane perpendicular to the axis of said drum.

Besides producing a controller in which parts are compact-ly assembled, it is a further object of this invention to construct a device which will be simple in construction, easy to manipulate, efficient and durable in use, and-cheap ito manufacture.

In the accompanying drawings, which illustrate the preferred embodiment of my invention, the several views are as follows:

Figure 1 is a front view of the controller with the casing shown in section on the line 1 1 of Fig. 4. Fig. 2 is a side view thereof Wit-h parts shown in sect-ion on the line 2 2 of Fig. 4. Fig. 3 is a plan view'. Figs. 4 and 5 are cross-sectional views on the lines 4 4 and 5 5, respectively, of'Fig. 2. Fig. 6 is a simplified diagram of the circuit arrangements employed with this controller, and Fig. 7 1s a development of the various contacts and binding-posts ofthe controller and a diagram ofthe circuit arrangements.

'Ihe casing for the controller has' a back 1, a bottom 2, and a top 3. The bac-k and botton are preferably formed in one piece, while the top is secured to the back by bolts. Suit ably fastened to the back, top, and bottom is a shell 4, which constitutes the front and sides of the casing.

The controller-shaft 5 is journ-aled at its ends in the top and bottom of the casing and provided with acollar 6, which bears upon the bottom. The movement of this shaft is controlled by a notched wheel 7, fixed thereon near the upper end and a lever S, pressed into engagement with said wheelby a spring 9. For convenience in assembling the parts of the controller the spring and lever are preferably supported from the top ofthe casing, the

spring being carried by a rod 10, provided with. nuts 11 for adjusting the tension of the spring, and the lever being pivoted upon a stud 12.

The operating arm or lever 1B for manipulating the controller is fastened to the upper end of the shaft outside of the casing and is provided withl a handle 1-1. In its initial position said arm is normally held against being moved by a latch 15, which is pivoted to said arm-and retained between lugs 16 on the top of the casing by a spring 17. This latch may be actuated by a button 1S, having a stem 19 extending through the handle and engag ing the latch.

The cylindrical member or drum of the controller is preferably composed of two shells or sections 2O and 21, which are supported from a bracket 22, pinned upon the` shaft. "Ihese shells preferably have lugs 23' formed thereon` which are bolted to said? bracket and insulated therefrom by suitable Upon the blocks 2-1 of insulating material..

cylindrical surface of said shells are lugs 25,

upon which are 'carried contact-segments 26, .Y

which are preferably detachably secured in position by screws 27 or other means, so that when the saine become unfit for service new contact-segments may be readily placed in position.

rIhe lower ends of the shells of the drum lare preferably held in their respective positions by a block 28, of fiber or other insula-t-f ing material, which is bolted to lugs 29,

formed upon said shells. This block preferably carries brushes 30 and 31, which arel electrically connected to one another and artio `A` or einotor. For conveniencethis resistance is illustretei in Figs. enti es connected ii- J; but in prectice sziitl rebll Y l pit-,ierebly be connectezl to in. the menner to be hereinafthere in practice the conseti in coni'ioction with e s'olenoizl- (not shown herein,) the lnusiies 36 i to' electrically-connecteil buttons AVVhen the, drum is in its initial position, shy short-circuit a resistance engen in 'series with the solenoid ot stiizl 'Y si, it-on, ere prei:

contest-fingers orresistance-terniinfils e ng the contect-seglcents upon i Y me pr'\"`ereblj,r ell inountetl upon t. block. Sill-, ol insulntine material, to the heel; of the controller-casing. euch have e bhnii11gpost -lG 'for e circuit-wires anni en ernieii thereto in. 'the nienner to Between ssicl tininsulating-partitions 12, ,rieti upon "the blocl; 3l? :intl outer entls ombres' if; the control-A )s ts igor connecting the Vlielti -to the contacts IQ. l

figposts enti coiitsct-l'ingers lool; the seine tire compnet essernif eue een reeChly-be 'piaceri 1n position enel here tne circuit-wires and resistance .iieo thereto.' @t course it will be unhet the field resistences might be con between the contact-lingers 38 enti the Mrinetune resistance connected be- 'ti-Jee the conte-cts 32.

v g. ti .l have illustrated in s. sin'ipliinietl ner the crcuit arrangements 'for the contro. herein described in connection with. a motor. For convenience in tracing' the circuits the-binding-posts 'forthe armature end Atieltl resistance hzwebeen omitted enti seid reshown c'onnec'teai directly between the 'lingers and conte/cts. ln dotted lines are indicated. the shells 2() snel 21 of the oruni, upon which are mounted the contact-see;- niens 25. to sti-iti shells sreillustretecl he contest-lingers enti the (litteriiositions yoli sciiti fingers with respect to the segments inflicstcd by the dotted lines il to l2, inclusive, running across seitl segments. it part of sei'l i'intgers are srrengezl 'to engage the contacts ol the shell enti the rest to engage the contacts .of the shell 21. Below the shells ere illustrzitefi the contacts 32 for the iield' resistance, and the so mounted upon salti block- .3?) l senesi reiliel flot/teil lines l to l2, inclusive, running across ssitl contacts represent the diiiferent positions of the brushes'() and 31 upon ssiJ` contacts es the drum is moved troni one-position to another.

The motor to be controlled by the controller is here represented as herring the arniuture ym, the. shunt-'lield m, und the serios 'lieloj in?. The direction in which the niotor wi-ll operate depends upon the direction in which the controller-druin is niovcti. Suppose the tiruni to have been turned until the contact-'lingers 38 arranged between the shells rest in the lirst position upon the contacts 26 of shell 121. The circuit to the inotor will now be closed and current will pass troni the 'positive line -l-l through the series lielfi mi enti thence by conductor Ll5 to the contact-lingers iler@ it will pass through all the resistance il and then ilow troni the shell 'Z1 bycoiuiuctors e6 and l? to the niotorernieture ym. Alter traversing seid armature the current will ilow by conductor 4.8 to the shell 20, i'roin whence it will pass byconductor i9 to the negative line 50. The shunt-held mf will be energized by current flowingI troni the positive line i4, through conductor 5l, across the brushes 3l ano. 3() and thence through conductor 2, shunt-held m", con- 1 nl. ctor 53, shell 20,encl conductor 49 to the is the drinn is turned to another the contactlingers having the 'resistance connected between the seine, are successively engaged by the short contacts upon the shell 2i enti the subdivision of the resistance 4l thus reinox'ecl one by one troni the ern'mture-circuit until the drinn reaches the sixth position, when ell the resistance will be rei'novetl troni the arineture-circuit. During all oll this n'ioveinent oi the :iruin the brushes 3U :intl 3l will have ritien upon the long contacts 32; but now es the druin is turned to the seventh, eifhth, ninth, tenth, eleventh,

negative line 50. Vli'roin one position iin/l twelfth positions the short contacts 32 will be engaged by seid brushes, and thus the sections ol the iieltl resistance S5, between the contacts 32, will be inserted in the circuit of the shunt 'lieltl to increase the speed of the inotorf Alf the clruin be moved in the opposite direction, so that the contactlingers 38 between the shell will eng-ege the seginents upon the shell 20, end the other iinger will engage the 'fingers upon the shell 21, the direction of the flow of the current in the motor-armature will be reversed, the current from the 1positive side ol the circuit flowing from shell 2O by conductor 48 to the urinature enti thence by conductor 47' to shell 21. in other parts ot the circuit the current will liow in the seine direction es before.

The diagram shown in Fig. 7 illustrates the sections of the iield resistance are each connected -IlO IZO 

